I have a new 2012 RAM 2500 with back-up camera. The truck's primary function is to pull a 5th wheel travel trailer. That makes the back-up camera useless. I'm wondering if it is possible to tie the back-up camera system into a camera mounted on the trailer. I don't care if the camera on the back of the truck is disabled, if I can see behind the trailer. My dealer didn't have a clue as to wether it was possible or not.